Lifting-jack



(No Model.) I Y A. B. GROWBLL.

. LIETINGrA JACK;

UNITED STATES PATENT OFFICE.

ABNER B. .CROIVELI OF RICHMOND, VIRGINIA.

SPECIFICATION forming part of Letters Patent No. 455,609, dated July '7,1891. Application filed July 8, 1890. I, Serial No. 358.030. (No model.)

To all whom t may concern:

Be it known that 1, ABNER B. CRowELL, a citizen of the United States,residing at Richmond,.in the county of Henrico and State of Virginia,have invented certain new and useful Improvements in Lever- LiftingJacks; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

My invention relates to improvements in lifting-jacks; and it consistsin the construction and novel combination ofparts, as willbe'hereinafter fully described and claimed.

In the accompanying drawings, Figure 1 represents a front view of alifting-jack constructed in accordance with my invention. Figs. 2 and 3are inside views, respectively, of the two sections composing the box orcasing of the jack. Fig. 4 is a side elevation of the jack, one of thesections being removed. Fig. 5 is an end view of the pawls detached.Fig. 6 is a detail perspective view of one of the links forming thebearings for the operating-lever. Fig. '7 is a similar view showing oneof the end plates for the lever. Fig. S is a view of the end of thelever with the plates attached.

In the said drawings the reference-numeral 1 designates the two sectionscomprising the lbox. These are exact duplicates of each other,

so that when properly placed together they will form a oasin g or box toreceive the work ing parts of the jack. These sect-ions are provided orformed with the rear vertical flanges 2 and 3, the anges 2 being ofgreater depth than flanges 3, so that when the sections are placedtogether the flanges 2 will meet, while a space will be left betweenflanges 3 to allow the tail of the follower, hereinafter described, tomove vertically therein. Upon the front of each section are formed theflanges 4 and 5 with an intermediate bulge and recess 6 to receive theend of the operating-lever. The

lower ends of flanges 5 are extended inward and formed with a shortupwardly-extending flange 7 and a semicircular recess or bearing 8. Atthe upper ends of the recesses 6 are formed openings 9, which form thebearings of the links which connect with the operating-lever. Vhen thesetwo sections are placed The numeral 10 designates the follower,

consisting of a metallic bar having a head l2, rack-teeth 13, and Aanoutwardly-projecting tail 14. This follower fits loosely within the Yboxso as to reciprocate freely therein.

The numeral 15 designates the operatinglever having at its inner end aseries of teeth .16, which engage with the teeth of the follower. Thislever is provided with cheek pieces or plates 17, having projectionsorlugs 18 and 19, which fit in corresponding recesses in the lever-bywhich they are retained in place. These plates' are also provided orformed on their outer faces with short studsor journals 20,which havetheir bearings in depressions 2l in the links 22. These links are formedat their other ends with journals 23, which have their bearings in theholes 9 in the sections 1. l

The numeral 24 designates a pawl for holding the follower and'preventingany downward movement thereof by engaging with the teeth thereon. Thelower end of this pawl is rendered so as to fit within the recess 8,which forms a bearing therefor. The upper end ofthis pawl has twoprojecting lugs 26, which engage with the teeth of the follower, and afinger-piece 27 for disengaging the lugs from the said teeth.

The operation is as follows: The jack is placed under the object to beraised and the follower elevated by means of its tail-piece until itshead rests firmly' against said object.

It will of course be understood that the pawl' is first disengaged fromtherack teeth. When thus adjusted, the pawl is allowed to engage ICOoted to and supporting the lever, a retainingpawl having lugs and afinger-piece, and cheek pieces or plates having' projections itting inrecesses in the endof the lever and provided with depressions on theirouter faces to form seats for the pivots on thelinks, substantially asdescribed.

In testimony whereof I affix my signature in presence of two Witnesses.

ABNER B. CROVVELL.

Vitnesses: f

WILSON WILLIAMS, JNO. J. CREER.

